HOW TO USE THIS MANUAL (Continued)

TM 55-2840-254-23

HOW TO USE THIS MANUAL (Continued)

Appendix A - References. This appendix Iists alI referenced publications needed to perform the

maintenance procedures in this manual.

K. Appendix B - Maintenance Allocation Chart (MAC). This appendix consists of four sections as

follows:

Section I - Introduction. This section is a summary of what is in the MAC.

Section II. This section is the MAC. The MAC assigns maintenance functions in accordance with

the Three Levels of Maintenance concept for Army Aviation. The MAC has six columns, containing the

following information:

Columns 1 and 2 - Functional Groups. These columns identify maintenance significant

components, assemblies, subassemblies, and modules.

Column 3 - Maintenance Function. This column lists the maintenance functions to be per-

formed on the items listed in column 2.

Column 4 - Maintenance Categories. The maintenance categories (levels) AVUM, AVI M,

and DEPOT are listed with individual columns. These columns identify the maintenance level at which

each maintenance function is to be performed.

Column 5 - Tools and Equipment. This column lists the reference code identifying the

tool or test equipment required, as listed in Section III.

Column 6 - Remarks. Remarks identified by an alphabetical code, where applicable, are

listed in Section IV and identified in column 6.

Section III - Tool and Test Equipment Requirements. This section consists of five columns,

containing the following information:

Tool or Test Equipment Reference Code. This column lists the reference code listed in

Column 5 - Tools and Equipment in the MAC.

Maintenance Category. This column lists the maintenance category (level) authorized to

use the tool or test equipment.

Nomenclature. This column lists the nomenclature of the tools and test equipment.

National/NATO Stock Number. This column lists the stock number applicable to each tool

or test equipment.

Tool Number. The tool number is listed to aid in identifying the tool or test equipment.

Section IV - Remarks. This section has two columns, containing the following information:

Reference Code. This column contains alphabetical codes or numbers in parentheses

corresponding to the codes appearing in the applicable columns in the MAC.

Remarks/Notes. This column contains the actual notes cross-referenced by the reference

codes to the MAC.